20XX (Steam) - Daily Hardcore Challenge #4 (Marathon, Undying, Stone)

As I continue to struggle with the dreaded "Probably Cheating" achievement, the last one I need to complete 20XX, let's do another Daily Hardcore Challenge to practice training with different skulls (since I need to beat Level 3 with 11 skulls on for the last achievement). This Hardcore Challenge uses the skulls Marathon (longer levels), Undying (more enemy health), and Stone (quadruple damage from stage hazards).
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